Millstone is a community-created Payload map created by ICS. The final version of the map by ICS was released on 1 January 2015. Similar to Swiftwater, the map was adopted by the UGC league for UGC Highlander Season 20 and is also currently in rotation for UGC Highlander Season 22, the map is currently in its seventh UGC version.[1] Millstone's Halloween version, Hellstone, was made official during Scream Fortress 2015.[2]